## A class of self-gravitating accretion disks
We consider a class of steady-state self-gravitating accretion disks for which efficient cooling mechanisms are assumed to operate so that the disk is self-regulated at a condition of approximate marginal Jeans stability. In an earlier paper, this scenario had been shown to lead naturally, in the absence of a central point mass, to a self-similar solution characterized by a flat rotation curve. In this article we investigate the entire parameter space available for such self-regulated accretion disks and provide two non-trivial extensions of the model. The first extension is that of a bimodal disk, obtained by partially relaxing the self-regulation constraint, so that full matching with an inner "standard" Keplerian accretion disk takes place. The second extension is the construction of self-regulated accretion disks embedded in a diffuse spherical "halo". The analysis is further strengthened by a careful discussion of the vertical structure of the disk, in such a way that the transition from self-gravity dominated to non-gravitating disks is covered uniformly.
## Contents- 1. Introduction
- 2. Self-regulated accretion disks
- 3. Self-regulation in self-gravitating accretion disks
- 4. Properties of models with a central point mass
- 5. Extensions
- 6. Discussion
- Acknowledgements
- Appendix A: modeling the vertical density profile
- References
© European Southern Observatory (ESO) 1999 Online publication: October 4, 1999 |